For the past week or so ive had the small red pin sized dots over my penis head, it is slightly tight to pull my foreskin back also. I am currently taking antibiotics for Acne so have been advised it may be a yeast infection?

Haven't had the same problem but I would avoid yeast-containing foods for a while and see whether that makes a difference.
If after a week the symptoms haven't changed at all, run to your GP or GUM clinic. Fast man. Actually, you could even book an appointment now just in case and then cancel it later on if you dont need it. That's what I would do but keep in mind I'm no doctor (yet).